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(#) Use Autofill

!!! WARNING: Use Autofill
   This is a warning.

Id
:   `Autofill`
Summary
:   Use Autofill
Severity
:   Warning
Category
:   Usability
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   3.2.0 (September 2018)
Affects
:   Resource files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://developer.android.com/guide/topics/text/autofill.html
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/AutofillDetector.java)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/AutofillDetectorTest.java)

Specify an `autofillHints` attribute when targeting SDK version 26 or
higher or explicitly specify that the view is not important for
autofill. Your app can help an autofill service classify the data
correctly by providing the meaning of each view that could be
autofillable, such as views representing usernames, passwords, credit
card fields, email addresses, etc.

The hints can have any value, but it is recommended to use predefined
values like 'username' for a username or 'creditCardNumber' for a credit
card number. For a list of all predefined autofill hint constants, see
the `AUTOFILL_HINT_` constants in the `View` reference at
https://developer.android.com/reference/android/view/View.html.

You can mark a view unimportant for autofill by specifying an
`importantForAutofill` attribute on that view or a parent view. See
https://developer.android.com/reference/android/view/View.html#setImportantForAutofill(int).

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/layout/autofill.xml:6:Warning: Missing autofillHints attribute
[Autofill]
    &lt;EditText
     --------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`res/layout/autofill.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"&gt;

    &lt;EditText
            android:id="@+id/usernameField"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="hint"
            android:inputType="password"&gt;
        &lt;requestFocus/&gt;
    &lt;/EditText&gt;

&lt;/LinearLayout&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/AutofillDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `AutofillDetector.testWithoutAutofillHints`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute `tools:ignore="Autofill"` on the
  problematic XML element (or one of its enclosing elements). You may
  also need to add the following namespace declaration on the root
  element in the XML file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;EditText xmlns:tools="http://schemas.android.com/tools"
      tools:ignore="Autofill" ...&gt;
    ...
  &lt;/EditText&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="Autofill" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'Autofill'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore Autofill ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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